Novel fluorescent film structure for white light LED and preparation method
A fluorescent film and white light technology, which is applied in the direction of electrical components, electric solid devices, circuits, etc., can solve the problems of increasing coating thickness and reducing light extraction efficiency, and achieve the effects of reducing mutual contact, improving luminous efficiency, and high light extraction efficiency
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Embodiment 1
[0038] 1) Preparatory steps: prepare the ultraviolet light chip, tricolor fluorescent powder and other packaging materials for LED; the excitation wavelength of the ultraviolet light chip in the present embodiment is 360nm, and the power is 1W; the red powder of the LED is a nitride, and the emission peak is 630nm (N630); the green powder is silicate, the emission peak is 525nm (S525); the blue powder is aluminate, the emission peak is 460nm (BAM460), all purchased from Shenzhen Prospect Technology Co., Ltd. Other packaging materials include LED brackets , insulating glue, silica gel, defoamer, diffusing agent, etc.
[0039] 2) Design pattern templates with different structures: adopt a uniform and equidistant arrangement, such as image 3 As shown, three primary color phosphors are distributed alternately, where different colors represent different color blocks. In this implementation example, the square arrangement method is adopted, and the phosphor powders of the three pr...
Embodiment 2
[0055] Compared with Example 1, the difference is that the pattern of the fluorescent dot matrix template is different; it is a mosaic template; the model is 20×20 color block area models, and the size of the fluorescent glue layer in the model is 20×20×0.1mm. Figure 5 (b) is a blue pixel dot screen pattern, (c) a green pixel dot screen pattern, (d) a red pixel dot screen pattern.
[0056] The optical properties of the white LED measured according to the above steps are as follows. (analog data)
[0057]
[0058] data analysis:
[0059] Layered coating of the bottom phosphor powder will hinder the light conversion of the upper layer. When the red powder is on the bottom, the blue light absorbs very little ultraviolet content, and most of the emitted light is red light. When the blue powder is on the bottom, the outgoing blue light is absorbed by the green powder and red powder on the upper layer. , reduce the light efficiency; and the mosaic arrangement solves the proble...
Embodiment 3
[0061] Compared with Example 1, the difference is that the pattern of the fluorescent dot matrix template is different; it is a triangular template; the model is 20×20 color block area models, and the size of the fluorescent adhesive layer in the model is 20×20×0.1mm. Image 6 (b) is blue pixel dot template, (c) green pixel dot screen pattern, (d) red color pixel dot screen pattern.
[0062] The optical properties of the white LED measured according to the above steps are as follows.
[0063]
[0064] data analysis:
[0065] Layered coating of the bottom phosphor powder will hinder the light conversion of the upper layer. When the red powder is on the bottom, the blue light absorbs very little ultraviolet content, and most of the emitted light is red light. When the blue powder is on the bottom, the outgoing blue light is absorbed by the green powder and red powder on the upper layer. , to reduce the light efficiency; and the triangular arrangement solves the problem of se...
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Abstract
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